Frequency-domain Compressive Channel Estimation for Frequency-Selective Hybrid mmWave MIMO Systems

Rodríguez-Fernández, Javier; Nuria, González-Prelcic,; Venugopal, Kiran; Heath, Robert W.

doi:10.48550/arxiv.1704.08572

Cited by 2 publications

(8 citation statements)

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“…In [11], a two-stage pseudo-exhaustive BA scheme was proposed, where in the first stage, the BS isotropically probes the channel, while the UE performs beam sweeping to find the best AoA, and in the second stage, the UE probes the channel along the estimated AoA from the first stage, while the BS performs beam sweeping to find the best AoD. A main limitation of [11] is that, due to the isotropic BS beamforming at the first stage, the scheme suffers from a very low pre-beamforming SNR [9,12,13], which may impairs the whole BA performance. Some mmWave standards such as IEEE 802.11ad [14] proposed to use multi-level hierarchical BA schemes (e.g., see also [15][16][17][18]).…”

Section: A Related Workmentioning

confidence: 99%

“…The first group (e.g., see [9,[19][20][21]) applies CS to estimate the complex baseband channel coefficients. These algorithms are efficient and particularly attractive for multiuser scenarios, but they are based on the assumption that the instantaneous channel remains invariant during the whole probing/measuring stage.…”

Section: A Related Workmentioning

confidence: 99%

“…However, extensive channel measurements have shown that mmWave channels typically exhibit an average of up to 3 multipath components, each corresponding to a scattering cluster with small delay/angle spreading [7,8]. As a result, a suitable BA scheme requires identifying a very sparse set of AoA-AoDs in a very low-dimension channel matrix [9,10].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Efficient Beam Alignment for Millimeter Wave Single-Carrier Systems With Hybrid MIMO Transceivers

Song

Haghighatshoar

Caire

2019

IEEE Trans. Wireless Commun.

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Communication at millimeter wave (mmWave) bands is expected to become a key ingredient of next generation (5G) wireless networks. Effective mmWave communications require fast and reliable methods for beamforming at both the User Equipment (UE) and the Base Station (BS) sides, in order to achieve a sufficiently large Signal-to-Noise Ratio (SNR) after beamforming. We refer to the problem of finding a pair of strongly coupled narrow beams at the transmitter and receiver as the Beam Alignment (BA) problem. In this paper, we propose an efficient BA scheme for single-carrier mmWave communications.In the proposed scheme, the BS periodically probes the channel in the downlink via a pre-specified pseudo-random beamforming codebook and pseudo-random spreading codes, letting each UE estimate the Angle-of-Arrival / Angle-of-Departure (AoA-AoD) pair of the multipath channel for which the energy transfer is maximum. We leverage the sparse nature of mmWave channels in the AoA-AoD domain to formulate the BA problem as the estimation of a sparse non-negative vector. Based on the recently developed Non-Negative Least Squares (NNLS) technique, we efficiently find the strongest AoA-AoD pair connecting each UE to the BS. We evaluate the performance of the proposed scheme under a realistic channel model, where the propagation channel consists of a few multipath scattering components each having different delays, AoAs-AoDs, and Doppler shifts. The channel model parameters are consistent with experimental channel measurements. Simulation results indicate that the proposed method is highly robust to fast channel variations caused by the large Doppler spread between the multipath components.Furthermore, we also show that after achieving BA the beamformed channel is essentially frequency-flat, such that single-carrier communication needs no equalization in the time domain.

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Section: A Related Workmentioning

confidence: 99%

Section: A Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficient Beam Alignment for Millimeter Wave Single-Carrier Systems With Hybrid MIMO Transceivers

Song

Haghighatshoar

Caire

2019

IEEE Trans. Wireless Commun.

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“…Another severe limitation appearing in several HDA beamforming works is the assumption of invariant instantaneous channel coefficients over a large time duration [1,13,14]. It is known that, in order to overcome the heavy signal attenuation, communication at mmWaves requires an initial beam acquisition (which we refer as beam alignment (BA)) [7,15,16].…”

Section: A Related Workmentioning

confidence: 99%

“…Actually, we have shown in our precious work[19] that, the phase perturbations over several strong paths are easy to compensate by standard carrier synchronization techniques given that a successful BA is achieved and the effective channel after BA has a very small time spreading. Due to the space limit, in(14) and also in our simulations, we will keep the phase perturbations such that the numerical results coincide with the conservative worst-case scenario.…”

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confidence: 99%

Fully-/Partially-Connected Hybrid Beamforming Architectures for mmWave MU-MIMO

Song

Kühne

Caire

2020

IEEE Trans. Wireless Commun.

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Hybrid digital analog (HDA) beamforming has attracted considerable attention in practical implementation of millimeter wave (mmWave) multiuser multiple-input multiple-output (MU-MIMO) systems due to the low power consumption with respect to its fully digital baseband counterpart. The implementation cost, performance, and power efficiency of HDA beamforming depends on the level of connectivity and reconfigurability of the analog beamforming network. In this paper, we investigate the performance of two typical architectures that can be regarded as extreme cases, namely, the fully-connected (FC) and the one-stream-per-subarray (OSPS) architectures. In the FC architecture each RF antenna port is connected to all antenna elements of the array, while in the OSPS architecture the RF antenna ports are connected to disjoint subarrays. We jointly consider the initial beam acquisition and data communication phases, such that the latter takes place by using the beam direction information obtained by the former. We use the state-of-the-art beam alignment (BA) scheme previously proposed by the authors and consider a family of MU-MIMO precoding schemes well adapted to the beam information extracted from the BA phase. We also evaluate the power efficiency of the two HDA architectures taking into account the power dissipation at different hardware components as well as the power backoff under typical power amplifier constraints. Numerical results show that the two architectures achieve similar sum spectral efficiency, while the OSPS architecture is advantageous with respect to the FC case in terms of hardware complexity and power efficiency, at the sole cost of a slightly longer BA time-to-acquisition due to its reduced beam angle resolution. Index TermsX.

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Frequency-domain Compressive Channel Estimation for Frequency-Selective Hybrid mmWave MIMO Systems

Cited by 2 publications

References 0 publications

Efficient Beam Alignment for Millimeter Wave Single-Carrier Systems With Hybrid MIMO Transceivers

Efficient Beam Alignment for Millimeter Wave Single-Carrier Systems With Hybrid MIMO Transceivers

Fully-/Partially-Connected Hybrid Beamforming Architectures for mmWave MU-MIMO

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